On 4 February 2016, the Thai authorities initiated a safeguard investigation on imports structural hot rolled H­-beam with alloy. The products subject to investigation are classified under the following HS codes: 7228.70.10 and 7228.70.90. This follows the application lodged by Siam Yamato Steel Company Limited.

On 28 January 2017, the Thai authorities imposed a definitive safeguard duty on the subject goods. The rate of duty between 28 January 2017 to 27 January 2018 is 31.43% of C.I.F. price. The rate of duty between 28 January 2018 to 27 January 2019 is 31.05% of C.I.F. price.